What is the most powerful food for your pet?

I have a sprite, unicorn, satyr, defender pig, wild boar, dragons, ice weaver, heck hound, cyclops, and a frost cat. Have any of you found out the most powerful food for your pets? I feed my sprite rock candy and My defender pig radioactive pizza and they work ok. I would appreciate input from anyone who can match the best food with the above pets. Or just share what you know about any pet and their most empowering food. In case some of you don't know, the better the food the more points you earn for your pet as you train it to higher levels, like if you just won 4 points, the food will add more points. Also save money by crafting their food. KI is killing us with pet expenses. So you understand I don't want to waste my time, crowns or gold on a useless pet or a low-power food.